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Capital gains for Zverev as he secures last-four spot in London

Alexander Zverev completed the last-four line-up of the ATP Finals with a 7-6 (7-5) 6-3 victory over John Isner on Friday.

The German came out on top in the key moments of two tightly contested sets to make sure he joins top seed Novak Djokovic in qualifying from Group Guga Kuerten.

Zverev will face Roger Federer in the semi-finals, while Djokovic will take on Kevin Anderson.

Isner – who had lost his previous two outings in his debut appearance at the season-ending tournament – put up a brave fight but knew his slim chances of progressing were over once he failed to win the opener.

Both players dominated on serve throughout, Isner firing his way out of trouble when 15-30 down in the seventh game before wasting his big opportunity when Zverev was serving to stay in the set at 6-5 down.

The American, handed the chance to compete in London after Rafael Nadal withdrew due to injury, saw a set point disappear in a flash with an ace from Zverev, who was far more clinical when a chance came his way in the resulting tie-break.